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DREAMS with Smart Inverter

In response to the policy of energy transition in our country, a huge amount of renewable energy will be incorporated to the power distribution system in the future. In order to solve the problem of the power distribution system limited by grid installation strength and intermittent power generation characteristic of renewable energy system due to maximum grid hosting capability, the “Distribution Renewable Energy Advanced Management System (DREAMS,shown in Figure)” can be used in coordination with smart converted to reduce the power factor of renewable energy system to absorb the virtual work in order to maintain the voltage quality. In addition to the effective management of the impact of renewable energy on the power distribution system, the simulation analysis of power distribution feeder can verify that, under the same voltage variation constraint, the incorporation of “Distribution Renewable Energy Advanced Management System (DREAMS)” in conjunction with the self-adjustment function of smart inverter can enhance the permissible hosting capacity of renewable energy system of the feeder by more than 20%.

DREAMS Planning and Construction Schedule

1.The power generation information of the sites with renewable energy system installation of 100kW to 1,000kW will be collected according to TPC DNP3.0 communication protocol. The information shall include power generation volume of actual and virtual works, power factory, voltage at duty point, and relevant set values. The aforementioned information should be sent back to the “Distribution Renewable Energy Advanced Management System (DREAMS)” via 4G communication system.
2.In mid-to-long-term the “Distribution Renewable Energy Advanced Management System (DREAMS)” is expected to be interfaced with “Advanced Distribution Management System (ADMS)” to execute remote monitoring of renewable energy site via transmission of control command to the smart inverter of renewable energy in order to enhance the grid resilience and to maintain good power supply quality based on maximization of renewable energy.

DERMS Planning in Future

The future plan is to adopt “Distribution Renewable Energy Advanced Management System (DREAMS)” in coordination with “Advanced Distribution Management System (ADMS)”, so the network topology architecture can be updated in real time according to the switching operation decision of dispatch of power distribution system. And the system impact analysis can be conducted based on the power generation information of renewable energy collected by the renewable energy management system in order to derive the control decision of renewable energy smart inverter. In the end the control station and download the aforementioned control decision to the smart inverter via 4G communication system to achieve the modulation of PV system power output in order to provide the auxiliary service function required by maintaining the safe operation of power grid.

Green Energy Estimate and Monitor System (GEMS)

The statute stipulates that renewable energy sold greater or equal to 1000kW must return power generation information to the Taipower dispatching control center. Most solar photovoltaic power generation information is not returned to the dispatching center. As the end of December 2020, the total system installation solar photovoltaic capacity was about 3.6GW. In order to accurately grasp the instantaneous power generation of private solar photovoltaic power plants, Taipower sets up a Green Energy Estimate Monitor System (GEMS). The GEMS’s model uses the monitored power plant as the basis to estimate the power generation of neighboring unmonitored power plants. The GEMS will count the entire solar photovoltaic power generation in Taiwan.